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Thank you, I'm trying to get a more aggressive look instead of the soft tail down look of the stock shocks. Has anyone tried the piggy back shocks that Losi (I think) makes for the Slash?

Haven't tried them but Piggy Backs offer no performance benefits only sweet looks. Most of the extra oil will not be circulated in such a small environment, also with more oil you have a greater chance of having more air left in your reservoir(s).

the stock oil is to light on pretty much every traxxas rc car. you need stiffer springs as well. your best best is to get an assortment of spring rates so you can tune the suspension. the spring controls ride height and the oil just controls the spring. so for instance stock the truck squats bad and seems to bounce around. this is because it needs heaverier oil. but it also bottoms out super easy because the springs are to soft which is why it wont even pop back up after compression.

what i have right now is traxxas white progressive rate springs in the rear and one large preload spacer on each side. for the front i have the stock rear springs with 1 full coil cut from the top and another from the bottom of the spring (to long) with zero preload spacers. i am using 45W oil all around and it doesnt seem to do to bad for me.

and by the way the w stands for weight. 45weight oil.........

another thing to remember is if you try to make the rid so stiff that it will never bottom out then you will have zero handling. these cars are meant to bottom out, thats why they have smooth skid plates. they just shouldnt bottom out over every little bump like they do stock.

how do you tell if you need heavier springs? in my opinion when you sit the truck down or gently drop it from an inch or so high the truck should sit just a hair below all the way up. if it comes all the way up and maxes itself out all the way up its to stiff. now you can adjust this with the preload spacers as well if it does not come up quite high enough. now how do you tell if you have the right oil in the shocks to match the springs? this is a trial and error thing. ok so say you put stiffer springs on and now you dont bottom out all the time but you get an extreme amount of body roll and the front of the truck keeps going up and down (or rear) but tires staying on the ground. this means you need heavier oil and you are to light right now. now say your trucks suspension doesnt get the chance to compress after a jump and the whole thing just kind of bounces all over the place coming back off the ground. this means your oil is to heavy and can not flow fast enough.

also note that you can change the valve inside the shock as well. the stock shock comes with a 2 hole valve. if you go to a 1 hole valve it will act as if you have a heavier oil. and if you install a 3 hole valve it will act as if you have a lighter oil in your shocks.

then you always have duel rate spring setups like the proline powerstroke shock uses. there are actually 2 seperate springs, one short, and one long with a spacer between them. what this does is allows the truck to have one spring rate for light terrain and another for big jumps. then if you get there spring assortment you can do all sorts of swapping out to fine tune it all. now i wonder if you can just use the springs on stock shocks?

and lastly i want to say that rpm also has 2 stage shock pistons to give you even more adjustability. here is the faq page.

I finally got the chance to buy new springs and shock oil. I got Losi Green 3.5 lbs 2" for the front and and Losi Blue 4 lbs 2.5" for the back. I also ordered Losi 45wt shock oil. Hopefully this will stop the rear end sag. Now I have to plan on what I want for new tires.......